What does 35N10 or 40N10 mean in terms of concrete mixes?
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Answers:
Concrete tend to have Newtons per square millimetre (N/mm²) spec which results in mixes being referred to as, for example, C7.5 or C20, which means that a particular mix will achieve a minimum compressive strength of 7.5N/mm² or 20N/mm² after the 28 day curing period. Weaker, bedding concretes are Class 7.5, or C7.5. Strength grade increases up to very strong, C40 concretes for civil engineering purposes.
Also, you normally have concrete about 25 slump and very sloppy mix as 50 slump.
So I'm not too sure where you got these figures from. Are they both 10 N and the 35 and 40 relate to slump or vice versa. Normally slump is not specified so is it aggregate size?
Hope that helps.
I took this off the Bonsal website (www.bonsal.com). They have a ton of information about concrete and mortar.
Q: When do you use mortar?
A: Mortar for unit masonry is intended to be used with brick, block and stone construction. The prime function of the mortar is to bond the individual masonry units into a consolidated mass. ASTM C270 is the Standard Specification for Mortar for Unit Masonry, which covers mortars for use in the construction of non-reinforced and reinforced unit masonry structures. Four types of mortars are designed as Type M, Type S, Type N and Type O. The most commonly used mortars are Type S and Type N. Type S mortar has a higher compressive strength requirement (1800 psi) than Type N(750 psi at 28 days), and Type S also has a higher bond strength.
Standard Specification for Mortar for Unit Masonry. Your asking about Type N concrete that has a 750 psi (pounds per square inch) strength.
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